* Renamed smart_unicode to smart_text (but kept the old name under
Python 2 for backwards compatibility).
* Renamed smart_str to smart_bytes.
* Re-introduced smart_str as an alias for smart_text under Python 3
and smart_bytes under Python 2 (which is backwards compatible).
Thus smart_str always returns a str objects.
* Used the new smart_str in a few places where both Python 2 and 3
want a str.
Adds a salted MD5 hasher for backwards compatibility.
Thanks gunnar@g10f.de for the report.
Also fixes a bug preventing the hasher tests from being run during
contrib tests.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@17604 bcc190cf-cafb-0310-a4f2-bffc1f526a37